Photoselective laser photo-ion microscopy with 5 nm resolution

Spectral selectivity has been attained in the method of field-ion microscopy with a spatial resolution of about 5 nm and time-of-flight determination of the photo-ion masses. Light-absorbing CdS_xSe_1−x nanocrystals in a transparent glass matrix are detected by irradiating field tips made from red light filters with copper-vapor laser radiation. The nanocrystals appeared in the photo-ion images as bright spots on a dark background. Pis’ma Zh. éksp. Teor. Fiz. 67, No. 7, 450–454 (10 April 1998)